package org.bouncycastle.asn1.x500;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERSet;

public class RDN extends ASN1Encodable {
    private ASN1Set values;

    private RDN(ASN1Set values) {
        this.values = values;
    }

    public static RDN getInstance(Object obj) {
        if (obj instanceof RDN) {
            return (RDN) obj;
        } else if (obj != null) {
            return new RDN(ASN1Set.getInstance(obj));
        }

        return null;
    }

    /**
     * Create a single valued RDN.
     * 
     * @param oid
     * @param value
     */
    public RDN(ASN1ObjectIdentifier oid, ASN1Encodable value) {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(oid);
        v.add(value);

        this.values = new DERSet(new DERSequence(v));
    }

    public RDN(AttributeTypeAndValue attrTAndV) {
        this.values = new DERSet(attrTAndV);
    }

    /**
     * Create a multi-valued RDN.
     */
    public RDN(AttributeTypeAndValue[] aAndVs) {
        this.values = new DERSet(aAndVs);
    }

    public boolean isMultiValued() {
        return this.values.size() > 1;
    }

    public AttributeTypeAndValue getFirst() {
        if (this.values.size() == 0) {
            return null;
        }

        return AttributeTypeAndValue.getInstance(this.values.getObjectAt(0));
    }

    public AttributeTypeAndValue[] getTypesAndValues() {
        AttributeTypeAndValue[] tmp = new AttributeTypeAndValue[values.size()];

        for (int i = 0; i != tmp.length; i++) {
            tmp[i] = AttributeTypeAndValue.getInstance(values.getObjectAt(i));
        }

        return tmp;
    }

    /**
     * <pre>
     * RelativeDistinguishedName ::=
     *                     SET OF AttributeTypeAndValue
     * 
     * AttributeTypeAndValue ::= SEQUENCE {
     *        type     AttributeType,
     *        value    AttributeValue }
     * </pre>
     * 
     * @return
     */
    public DERObject toASN1Object() {
        return values;
    }
}
